That's an excellent build! However, you will need DDR3 Dual Channel instead of Triple channel. Only the X58's (the I7's) support Triple Channel at this time.
*A few side notes*
- A soundcard isn't necessary because onboard audio is normally pretty good quality. But if you want it, go for it.
- 1000w is quite a bit and your system will operate fine with ~650-700.
I have always used OCZ for RAM because of their price/reliability/warranty/aggressive performance.
I recommend for RAM:
OCZ Reaper HPC PC3-10666 (4Gb)
IF you have proper clearance inside your case.
OCZ Fatal1ty Edition PC3-10666 (4Gb)
As for the Power Supply, I would suggest a Corsair TX750 Non-Modular
In case you decided to CrossFire in the future, or do a RAID setup.
I would wait for another person to look at this as well before you buy - I'm not much of an AMD specialist.